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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ce21622790236678c6c2b5efd45d397f0c74a71e2adb0a0aeff0419b066b7f' 
  AND token = '2uKV4YCEqPbcImd/4xp/MMcRjQ+sHHrRB1Y30+b3ObE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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