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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506b76e7c1eb233b4cbef005f0ff94c06e6bd28a3dc247870d4435423e85a6be' 
  AND token = '4bM1KA59Sasf68YpoTv0YYbtWH9KA33iZ6OQLRMfhyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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