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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c13f97e08bd75e903e35027860dbcf3bce8d7975200af41f4f42e36d08b13cb' 
  AND token = 'LL4pw3bmtCciqYbVqL5jVB69tXpoBkvd9vFHNg31qcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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