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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f67af361686c480de624c046738e5e3cff3186d90ea47e1141cc01f3ff4988' 
  AND token = 'ayQ8VOBKBtIhL+aomQjXYPduN795PqA60EGxmZSnMek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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