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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df81f9f7329bb5acf3e1ebf9a9b1e8b88eb9939e21f618d5e4c048f1746e96ec' 
  AND token = 'BRCGEj0qZNtMvHgy/nJ9PBNqvQjGT9fiDAmUbtZiOZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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