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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be99fea1b40e5d4f0d73d50cf1d9a5bf08bddc03883c6b6e5e974905fc9ace1' 
  AND token = 'BGQitiRyj7sjj7+j/CU9fojWxQBD2Sic+Gz/tkn6smQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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