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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc67b5f5ab708b565eec2f9d068893f78efe7e55d28685af4c1f0bd47b86453f' 
  AND token = 'mkN61AwxZ1+sITLRaK4Uiw2sAbisTt33BLvOeTtrJ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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