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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d7aa299eb8cd25648e4e2681f0a34bdf3a1340a07a013db1e34d07506cd6c1' 
  AND token = '7bg1HcgK3pAzrKuT5CfN4oHMELSuvPUhkSlNJcz7P+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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