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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56845f370f1b0cf0fc708eaa7f820a9992cbe393673d8b8688a4f6866ccde513' 
  AND token = 'B4wA296sSODqAStd59o04daOsV6PRctRSm2lMg39uRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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