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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68edcc84725960ff8f4239060e014cb8de816cbeed4a48afe2efa11783cf6b3a' 
  AND token = 'QPjFI9cjoXZKw9T9IuL5C74vA6yY4ZBzrqqkXUk7K6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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