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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed0d9af720652b11a9880767800977f6aac3b14d8ab08b65cfaaf99ab2aa9a3' 
  AND token = 'uYYVAPt2xH3R8u9AkIE/eYK1cj41W7s57uRYqwI/JeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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