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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253f463286816494aeb4bc37669981b4d4606a163f301ca9d2467ee79b8fe920' 
  AND token = 'zOb0B3g0Gvj5R58NN1NLkAXhRK4KOG6vxqOzWOfh6Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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