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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb833d2928ac4d4c789e0e52abd68b13c2908f4acd486f04d5e50911b4edcb7b' 
  AND token = 'hbPaieZUQ0CVPhymah5ZIE6J32d03IEJdhoThZCnXLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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