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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd9d090dda4513b8e02872ebd8db1dd760af7a102fa16e7b2423488982450e6' 
  AND token = 'wHXaCKxBP5XY1VO9ozqg4ezzt1Vm/2Ek0AZlJXngp5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}