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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6503de88dc5eae2a1f79eea3582691b30d0b3dfc274cf63cc47e5c8788ef6d29' 
  AND token = 'WjgbaPZQOW3Vqnl666QJ6QdI9nQuFktVGk19yoQQuxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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