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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca85bb6c8dac98dd9ad5580b7baff9d4264cc7968c20b1041b1c50401329db5' 
  AND token = '3Su08p4LimPi7iLFt8jRmpPKJJXx1QhTcGpddNmUrmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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