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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5c6db34c955dd40a72e4771d88660b494582266eeecb6464a9da75b6b618b9' 
  AND token = 'FdruC6AOH7gzn06AcVZtk4CeEY8v4mYMPhXx7/iODYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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