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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735bda90bf86ec0f734f6effeecc37e3d1862705c716852cef24a2ca068b2f24' 
  AND token = '+wdkYNAtOyoNomK9P3MMTF6HBl6A6GmnbO0GoOqfhSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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