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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001f732ed86a5fd10482cd07047a4fae461e9c64b4e575bb407a63ef8b297ad6' 
  AND token = 'cSvU8G2QhXAzda+6D2sozWe+l8nJWdS3CctUPsWy/sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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