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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6524f4a12b421d8a7d1d06e35a2811d3dffcd828de5507aa2081c1c6ed3c7cea' 
  AND token = 'DScG+UsTPMkA26iAYsH7/CSChhxEOCuc1vRMqYSBbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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