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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac736b3816a48262b491b25026eb0e9acbe95e0a9c28af5faf7eac966bff9560' 
  AND token = 'frbUvVWAMeghyKnYBb3Hf0p1t1lSEklAiaim44eIWfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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