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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9c65c7ab8e285847f852ad8c59d66adad968830e93d000fc93eee2bd414b03' 
  AND token = 'd0qKUPuMFUUTbNCnvYhTdg7zPO9reSTqdm8/yh4Lf1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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