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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5d4d1ac19f09dedd11db0cf1df4fb09fcc778805bd56de33f103ed28072eee' 
  AND token = '6RVhj1Q/AE0iDoXUrie/vpoy1KebNHhXwdy+xksbqAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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