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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11767978eadbb38e1281377c4824e5d2131a8cc67f7a55b45bf4b2734535f1a1' 
  AND token = 'MtbL82mxOVKicVEsq2HYbzBDOdbtOAqJunf+9y2tGuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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