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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58483ce40da3e2fde68de04b264f1d6a2210f867846f8d6947ad07cd1340d672' 
  AND token = '2k8EROZ3V1iU24t4j1ap7nrfSn17sDrsEi/w3ZXbXYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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