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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55369aded647cf6aa255886a4948bf5f72c3eae62b07b7080f0f5983f05fc34a' 
  AND token = '5Z9LnBjpa2kRLG12zv6aWNcUYw96IsCFTKECI2OhCU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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