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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b217ab763edf55b22440bba2d09e5d0fea142954fe4ca8bde4b8458ce82a8bf2' 
  AND token = '95JQ0oFDwx+Urs2y74G36H3jxnNTN86QTK1ObV3Ftc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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