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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10610135fd76b16f8f18988063f348dea1c44ec3c02645bbd8b065a7c02e945' 
  AND token = 'YKYM/c82f7ZkIeePPEEaL3yLjEYJmpS2JgmNslq7GDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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