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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83793f6aa3adfca256d0758cc48cbe5b19568eebd8f2fc874313d1f9d426385' 
  AND token = '5cDG7B+1e5oWmMrJsSYamHadhRjcA9KE4LK10sQGfxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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