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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95499c0b30daef2194d0cab0d2daf7b6d9f530c88c347a5d7157aa356d179564' 
  AND token = '6ONAvP0kEhKDJhQoi/ORS19t3rFdLyZHu+gmoybtyn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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