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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386cb77e23db95b25439d18e0aa2fcbeda03c9ba977d43ce49f0388e244cdf42' 
  AND token = 'mntUJIJXmeO8BmWHZj78J+y9Uod14qogIf+58BXVpAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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