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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0da5487f77efc5e55a64f3164968442bb2f2e54acede00d389eeadfb9facbb' 
  AND token = 'vIMiWKti+m8owI4kIMmvYEPe9G34Ruo2w2LwUwa2yF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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