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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94acb32a9491178e55a25ec899fad778f01e36111cdabcb04f34265dcc2dbcae' 
  AND token = 'O5+xdVuxCEW6N8mX4Ik5FSeFafxDTBLJPxzJr8WpHxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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