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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf396900e2a0a1a778d175ef7e10c54b5968ddc6bbf14507f74754206c134e1' 
  AND token = 'x8IilEyTOdfNQv2K4LGMJ/xwBNaAYQVzxBif8x/2jY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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