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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd23cfde28fb5dd20d4e894aa5e4b660d71fff52962a14cedc141b59f3320a13' 
  AND token = '5duwkmd5JdStkfWv+DRy/lduxG6XOd7IuwR3Kz2CkAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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