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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ba6e2c39ad387530051d377425d58e297128f3534c741afc589f5770041cb0' 
  AND token = 'zlZMNgACI0XxEa7REUDj8/eCqXXdAxQ4bvDolNE7ws4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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