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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e079b70279bea6a750c89609dc45ed56dbc93dbd1a429efa90d0ad350e23e3' 
  AND token = '4+e2XAuoPCnenVz4sgDc2qL/yyrfMGLoI5p2w/4XGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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