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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a71a21a3a8c47332736ea83f7083e6af5974d87f8b9db37082a23fe2eeeefd' 
  AND token = '29GjlHj0ZVV3aKPJE703gPtCiCeX7PrJlFxsNupRuA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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