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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c2c3db3e5fa2fc07c07d9d703848b614336b41a34c575fb08900cedefa8faa' 
  AND token = '9HvAT0qqg4FpzPIHzSg1wbGL9wO8plA9n5mxTkiy9Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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