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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f0960b654208072386b8482cce647cfa389f8700f9b5722595cab412efc1d6' 
  AND token = 'lutwRow6SwTSQ5BbWqKt0lHbnJwbrM1I1QA/L6+rZLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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