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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc23d9869836ba9b0226312ff5e84003135a8383128d62d4ea34086a9e82635e' 
  AND token = '3T3H77W7xwqe5S/CxEPwQODwoZwYh2sZDdEYllmvg4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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