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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5f47422da15a3496da9caf757a9cbac05d2b9adc91a4828756e12906859faf' 
  AND token = 'Gk1qMjReQ6G0dQzROInY0dDhYGijap9MAkSwyUpZzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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