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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e746acc157b67eecd9c09c7fe24f68213e929fcc2e47d4ad676f4bee24f324' 
  AND token = '99EU2G8W2OwGBPDcH13snxf7NdVSlNfLzyGOM2VGOxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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