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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56f87eb90dc04bd880e480b1b5d96796621c7794648bc5dd666ead30f73565d' 
  AND token = 'D5ueLmEQiv9o7RWWTC8KZUZ1Su8GoWPlrXXRmKx/TbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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