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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9553890bafb17fd0b1a0d4ad5a8bf30420af6986c7e6702ddfb53c9f2f38b8' 
  AND token = 'opz5tMhSxa7xoh1QnBZvTlSb4XlcCNSdrvc3YOIbvEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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