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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55f990c3bd5f9952fd5a038e87e761471f10004000c39a92291cbc8a88b5f2e' 
  AND token = 'gsE2zy7P79hkH7+FJg3rHm7DRlAX6TSuBvvrdFuiZag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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