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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4754d3c44612846f66abdc1364465befea94454ab89fa4e74a4214d8295b9df' 
  AND token = 'cAOuwQR0K0EEKTYf5bWhXb4YHjSSqGmXa/wtnvXaXwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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