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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b858ed57d82904bfbe7f6e01b9c9d7e4aca56fc90416705b12c3ba82418bf0' 
  AND token = '/6t0dAoSK8vfDabtnPnGytx6vYKhX4NNCXGW8DnE0b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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