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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8148ae84a0fff87f5d6698c1e7fea4b43442b71297755e6f335469782a1ece16' 
  AND token = 'ujjxQEY/TG94HvS1sO52qb4Fvd+8Qt2BR6cjqCIqu3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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