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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ca409f438f3d1116e9f250f7a65d4b6fe1dcc434e201cd143a22541d3889bf' 
  AND token = '+ONpIapyCrRUy9sBa3gmMaOelbZ7whleYdmrdpF0pv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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