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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae518c7a77c30a963c6df6708a5f2a02064049bba7590f50fd9c2a0698073fc1' 
  AND token = '31oM1UBjpov2AmMknhNymAG4/Alw7UTRWT2O9ozqGaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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