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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5487a80899d57a6ce2b8f43aa79fb1b80e1d584013e2fa6e249ec118b0d261a8' 
  AND token = 'lipQCDBkUMQzI7/BEGL8PBeRP5/N6Qdtn55wDSfxylc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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