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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70568441df1e5b24eff81e171ba6a1b42e60cb19de5e71bf1268ac6a513314e' 
  AND token = 'lwAtZ5Mg/AIe3LGvTX61IGRk9ehoUPR5qrNcIQtwZZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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