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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8172e46ee48be0ddab4baab1244bcdd3b7b13cb8be5e07aa15692d4a1dbb9b7' 
  AND token = 'g7MwrYdr+ppR+YZJU3q+RoBdBX1VtPRmtB7NltFhvco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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