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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd975a65b82378653100b10d0d6dec4cb8d18953207b4ebba231eae8a0ac21ec8' 
  AND token = 'lAQ1K73Lo8R/TaWuFqtqepq3BJ74WalD/YEPfcBk/h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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