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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd5a96b6209e5c879041e1da62c47af4d104583f9a57cb6ea4d15d271d0d19c' 
  AND token = 'qVL6adYuYyS0a63y6QVyDS5Eavz/DKrWjOeihT0UXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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