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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0f588f1678daeee81be784391eebae1d847dd25d356603e3a9cbf0cd775584' 
  AND token = 'sCVrPijUyOHNjqkC9kv586WX/4XXHhj1n0rGY1F6PLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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