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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0db0ff3354377c99ff3fb239f573a1bb7aad6e2875a6127e370197283c51b9d' 
  AND token = 'gFjovModvdvzH3fYndAdrHO0MbZZ11G30QeuQnWrj10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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