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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36daf4d82d275e2fd0547e21b50eb4d65213876c839777619cf3b96eea59993b' 
  AND token = '4VjqYgmbm104zEselE8QYCqdzI6UlS/hVbmFVyK7Nz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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