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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd119dd81bef6713f03d5642294e76ff6e73a721eceeedd40d4c2d7fdfd533065' 
  AND token = 'lc0a4nlWmJ+wfirsEqa78iEDvKElvsvyVNzCobe74FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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