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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da112620c25b261ff8bb3de692dbde6ea79f92a41d88c4550c8f6afeab1b6409' 
  AND token = 'Sur3KNGG5q28BP/aAQGBX+ny3tsRkFlse6zvP5PGkvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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