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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d35e5589b771ba6d41a466e57a46f5baf8a47a8479194e0aaadd56db05a00d' 
  AND token = '9BCPIy4bSKsLh0geCMW+DeG9YiLgF1t/pTynEI3w1F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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