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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e001e2d347032d9cef01f2c3948f7e0b4062e4f8508a2fc9004c9df784e123' 
  AND token = 'WbgjtRxs2eMgnaORJBSKWTkz/DBJk8v78uaX8P8rg18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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