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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6b323c8f262f4a74db66821f54cf759eb41e1880595a01c16205170850c7c3' 
  AND token = 'YfFBc90+qI0xNmakxykhz6kau57llpc5qyPvhBxMqnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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