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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee791ecb4ae300a0bb10bf9dcb3fe9ae2bb3475dd7f92297b7e585b24d15bf2e' 
  AND token = 'Cyz0i2DlGtvYuKgBIJds3xDuGHPscaFBLs1aCX0Exhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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