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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e943e9d990bac527ace41526c91803bde6475728f79f8b8402d8770fa36556c' 
  AND token = '3g5ews4Ft/PiC1a8rm6BGO1ZkEo6FE/1s8auBg97FLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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