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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed155ad6fb3af367ce444bb9058c1ae7994d8ef02ac647e2114daf026b1d58f2' 
  AND token = 'nhQtxKEjDobiSh2+vudmypiy5aCwMQcnE5EaOCf/ooM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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