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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9854d2b44a33988d3f61f4c757c009b1a558f2cca6118123a3aff054b294b5f3' 
  AND token = 'qJYxNPpysmk1E44yWL32K46833VmJV2uyQLMCEHzo7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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