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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2766d7e6845013f9cb5a2b37f1951523804f14f2d57b77a323ad3d88bda1720' 
  AND token = '2gMnZaAMZjRgvpwd2pw98snwpoi4N+bMWWjkt+XCCP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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