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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099f718472fb22891820bbfedd19c1c2035c618fe9daa351fc7c325e0720b5df' 
  AND token = 'bfGNJ1RCirPnys/hkshqGhRpvuOuIgW0t9F5o111PR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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