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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704c958d8517a1073538ebb43704edab359ab333c3fa9e95bda910d942b9cb57' 
  AND token = 'D8s/48gASgb9aHn3s03YHOjuTdr1/g4v7X404j0p95A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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