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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6be2baee9f180041a054c58f57ab4a8e2a05e610822ed5c16ab5d5b4f4489c5' 
  AND token = 'GyNhN5Xir6hOblJzQ51AjOeRkbYToz9Y9MeDwHYr5Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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